Electric incandescent lamp



. 8, 1959 w, HONING ETAL ELECTRIC INCANDESCENT LAMP Filed Oct. 27, 1954 INVENTORS WILHELM HONING JUSTIN ADRIANUS VAN DER KAM gwwyy AGENT U iw States P re ELECTRIC INCANDESCENT' LAMP Application October 27, 1954, Serial No. 464,994

Claims priority, application Netherlands '5 November 4, 1953 4 Claims. (Cl. 313-276) This invention relates to a filament mounting structure for an electric incandescent lamp and has for its principle object to overcome the possibility of vaporized filament material deposited on the film carrier from short circuiting or otherwise causing a defect in the lamp.

According to the invention an incandescent lamp is provided in which a pair of spaced vertical carriers are mounted on a support and a pair of transverse insulated carriers are secured to the vertical carriers. is suspended within the space defined by said carriers by securing means spaced from said transverse carriers and connected at one end to said filament and connected at the other end at a point on one of said transverse carriers located in a position remote from said filament.

As experience has shown, a very simple solution of the above-mentioned problem is thus obtained. Thus, in a preferred embodiment of a lamp according to the in- A filament I vention the securing means for attaching the transverse carrier to the vertical carriers are connected at one end to the vertical carrier and at the other to a point on the transverse carrier remote from said filament.

The cross-section of the said carrier may be shaped in many different forms. If the cross-section is circular it will in certain cases be preferable for this transverse carrier to have a groove recessed in it at its side more remote from the filament, in which groove the points at which the supporting wires emerge are arranged.

The invention will now be described with reference to the accompanying drawing in which:

Fig. 1 is a front elevational view of a projection lamp in which the filament is stretched in a plane;

Fig. 2 is a side view of the filament according to the invention partially in section and partially in elevation;

Figs. 3 and 4 are modifications of the device shown in Fig. 2, and

Fig. 5 shows the connection of the carriers according to the invention.

Referring now to Fig. 1, a lamp bulb 1 has vertically extending longitudinal carriers 2 with a U-shaped profile which at 3 terminates in current supply pins 4 which extends so as to project beyond the lamp. These current supply pins are sealed to a dish-shaped glass 5 to which the glass bulb 1 itself is sealed at the zone 6. The dish-shaped part 5 includes an exhaust tube at 7.

Between the vertically extending longitudinal carriers 2 transverse carriers 8 and 9 are arranged consisting of porcelain rods of circular cross-section. Metal wires 10 projecting from the end faces of transverse rods 8 and 9 are secured to the longitudinal carriers 2 by soldering. This results in a frame construction in which a filament 11 is stretched in zigzag. This filament shown in the embodiment of Fig. 1 consists of six members with its ends secured to the longitudinal carriers 2. The filament is maintained in the position shown by means of the securing means such as supporting hooks 12, 13, 14, 15 and 16. The supporting hooks 12 and 13 are secured to the transverse carrier 8, the supporting hooks 14, 15 and 2,916,650 F at enter! 8, 1959 16 to the transverse earns-=9: The appo ntment 14,15, 16 which consequently aresecured to thleftransverse carrier 9 are directly inserted 'intheporcelain rod 9' at' 'its side adjacent the filament; Itf-is common prac tice to arrange the supporting hooks in the car rierfarranged over the filament during operation of the'jlarnp'in the same manner. Howevefl itis found'that in? this event a layer of vaporized filamentmaterial may "settle on the side of such a carrier "adjacentftheffilament, which layer extends between ithef'pointsgat which the supporting wires ar'ei inserted and, co se q u'ently mayjjgive rise to breakdown orshort-circuitinglf I By now arranging the points at which th'e supporting hears-seawee inthef carrieridarranged over filament duringoperationo'f the lamp'a't 'tli'e side' of car rier more remote from the said filament, as is illustrated in Fig. 2., filament material which settles on the lower side of the carrier 8 is prevented from being brought into contact with the supporting books at which a potential is set up, with the result that the above-mentioned disadvantage is obviated or at least materially reduced.

As is shown in Fig. 2, the cross-section of the carrier Fig. 3 shows an embodiment comprising a carrier 17 of triangular cross-section, the apex being turned down. Fig. 4 shows a carrier 18 of circular cross-section. It has a groove 19 recessed in it, in the base of which the supporting wires 21 are inserted.

In the embodiment shown in Fig. 5, which is a perspective view of a modified construction, use is made of a triangular transverse carrier 22 in the upper surface of which not only the supporting hooks 23 and 24 but also the wire 25 joining the transverse carrier 22 to the longitudinal carrier 26 are inserted. Thus, a conductive layer is not likely to form between the points at which the wires 25 joining the transverse and longitudinal carrier are inserted. As may be seen from Fig. 5, the points at which the supporting books 23 and 24 are inserted in the upper surface of the carrier 22, are staggered.

While we have shown and described the preferred embodiment of our invention, it will be understood that the latter may be embodied otherwise than as herein specifically illustrated or described and that in theillustrated embodiment certain changes in the details of construction and in the arrangementof parts may be made without departing from the underlying idea or principle of the invention within the scope of the appended claims.

What is claimed is:

1. An electric incandescent lamp comprising a support, a pair of spaced longitudinal carriers mounted on said support, a pair of insulated, spaced, transverse carriers secured to said longitudinal carriers, a filament arranged 2. An incandescent lamp as claimed in claim 1 in which said transverse carriers are connected to said longitudinal carriers by additional securing means connected at one end to said longitudinal carriers and at the other end to a surface on said transverse carriers located opposite to the surface facing said filament.

l i 4. Anel tric. incandescentlamp comprising .a supnort apair of spaced longitudinal carriers mounted on saidllsupport, a pair of insulated, spaced, inverted triangular transverse carriers secured to said longitudinal carr iers a filament arranged within the space defined by said carriers, wire securing ,means for maintaining said filament taut and connected at one end to said filament and at the other endvt o one of said transverse carriers atva -point on the base of said triangular transverse vcarrier,

each of said wire securing means being vfiired to. a surface of saidtransverse carrier on the side thereof opposite to sidethereof racing said filament, said vvire securing ineans approaching said transverse, carrier from the side opposite to the side of securement of said wire securing means to said transverse carrier andbent around said carrier to the point of said securement.

References Cited in the file of this patent I UNITED STATES PATENTS 1,480,208 Houskeeper Jan. 8, 1924 1,822,731 Harding Sept. 8, 1931 1,869,572 Massie Aug.'2, 1932 1,936,762 Howe Nov. 28, 1933 1,980,936 Van Steenis Nov. 13, 1934 2,006,820 Adams et a1. July 2, 1935 2,019,484 Clark Nov. 5, 1935 2,069,638 Wright Feb. 2, 1937 2,597,681 Smith May 20, 1952 2,622,222

Hageman et al. Dec. 16, 1952 

